/*
 * Copyright (C) 2010 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.example.android.apis.app;

import com.example.android.apis.R;

import android.app.ActionBar;
import android.app.ActionBar.Tab;
import android.app.Activity;
import android.app.Fragment;
import android.app.FragmentTransaction;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import android.widget.Toast;

/**
 * This demonstrates the use of action bar tabs and how they interact with other
 * action bar features.
 */
public class ActionBarTabs extends Activity {
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);

		setContentView(R.layout.action_bar_tabs);
	}

	public void onAddTab(View v) {
		final ActionBar bar = getActionBar();
		final int tabCount = bar.getTabCount();
		final String text = "Tab " + tabCount;
		bar.addTab(bar.newTab().setText(text)
				.setTabListener(new TabListener(new TabContentFragment(text))));
	}

	public void onRemoveTab(View v) {
		final ActionBar bar = getActionBar();
		bar.removeTabAt(bar.getTabCount() - 1);
	}

	public void onToggleTabs(View v) {
		final ActionBar bar = getActionBar();

		if (bar.getNavigationMode() == ActionBar.NAVIGATION_MODE_TABS) {
			bar.setNavigationMode(ActionBar.NAVIGATION_MODE_STANDARD);
			bar.setDisplayOptions(ActionBar.DISPLAY_SHOW_TITLE,
					ActionBar.DISPLAY_SHOW_TITLE);
		} else {
			bar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
			bar.setDisplayOptions(0, ActionBar.DISPLAY_SHOW_TITLE);
		}
	}

	public void onRemoveAllTabs(View v) {
		getActionBar().removeAllTabs();
	}

	/**
	 * A TabListener receives event callbacks from the action bar as tabs are
	 * deselected, selected, and reselected. A FragmentTransaction is provided
	 * to each of these callbacks; if any operations are added to it, it will be
	 * committed at the end of the full tab switch operation. This lets tab
	 * switches be atomic without the app needing to track the interactions
	 * between different tabs.
	 * 
	 * NOTE: This is a very simple implementation that does not retain fragment
	 * state of the non-visible tabs across activity instances. Look at the
	 * FragmentTabs example for how to do a more complete implementation.
	 */
	private class TabListener implements ActionBar.TabListener {
		private TabContentFragment mFragment;

		public TabListener(TabContentFragment fragment) {
			mFragment = fragment;
		}

		public void onTabSelected(Tab tab, FragmentTransaction ft) {
			ft.add(R.id.fragment_content, mFragment, mFragment.getText());
		}

		public void onTabUnselected(Tab tab, FragmentTransaction ft) {
			ft.remove(mFragment);
		}

		public void onTabReselected(Tab tab, FragmentTransaction ft) {
			Toast.makeText(ActionBarTabs.this, "Reselected!",
					Toast.LENGTH_SHORT).show();
		}

	}

	private class TabContentFragment extends Fragment {
		private String mText;

		public TabContentFragment(String text) {
			mText = text;
		}

		public String getText() {
			return mText;
		}

		@Override
		public View onCreateView(LayoutInflater inflater, ViewGroup container,
				Bundle savedInstanceState) {
			View fragView = inflater.inflate(R.layout.action_bar_tab_content,
					container, false);

			TextView text = (TextView) fragView.findViewById(R.id.text);
			text.setText(mText);

			return fragView;
		}

	}
}
